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Lamb waves propagate in solid plates or spheres. [1] They are elastic waves whose particle motion lies in the plane that contains the direction of wave propagation and the direction perpendicular to the plate. In 1917, the English mathematician Horace Lamb published his classic analysis and description of acoustic waves of this type. Their ...
Northward propagation of the East Pacific Rise into the North American plate initiates rifting off of the Baja California peninsula. 4 Ma Pliocene Sierra Nevada begins to rise. 3.5 Ma Pliocene The Pacific plate changes its direction of motion about 11 degrees east of its previous heading, from northwest to the present northwest by north.
The North American plate is a tectonic plate containing most of North America, Cuba, the Bahamas, extreme northeastern Asia, and parts of Iceland and the Azores.With an area of 76 million km 2 (29 million sq mi), it is the Earth's second largest tectonic plate, behind the Pacific plate (which borders the plate to the west).
The orogeny is commonly attributed to events off the west coast of North America, where the Kula and Farallon Plates were sliding under the North American Plate. Most hypotheses propose that oceanic crust was undergoing flat-slab subduction , that is, subduction at a shallow angle.
Eastward Miocene dynamic tilting in South America provides a mechanism for the Amazon River drainage reversal. [14] [21] [22] The rise of the Andes influenced atmospheric processes including the South American Monsoon. [2] Paleogeography of the Indian tectonic plate through time. Collision of the Indian plate with the Eurasian plate created the ...
(The Center Square) – A new Republican oversight report accuses former Congresswoman Liz Cheney of colluding with witnesses in the Jan. 6 Select Committee investigation that she oversaw. The ...
Downing Street and the Foreign Office are preparing to offer the incoming U.S. president an invitation once he is back in the White House, the report said, without citing specific sourcing. The ...
Atwater is perhaps best known for her work on the plate tectonic history of western North America. [12] She wrote two major research papers outlining the history of plate tectonic evolution of North America and tectonic problems of the San Andreas Fault , which assisted in documenting the history of the San Andreas Fault.